Roger&Me said:Although it can hardly be called a "source", he is a self-proclaimed heroin user in his lyrics. He raps about dope and needles and shit. He pretty much does every drug that exists I guess.
You'll never hear the more hardcore shit said on any of the popular stuff. Its all hidden away in mixtapes.
I have never heard him say he shoots H (and I have most of his shit on my itunes).
He does have a verse on Drought 3 that talks about how his boy is a junky and missed a shot in his neck and his whole face swoll up.
I could be wrong. Tell me where to look.